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Related Concept Videos

Alkali Metals03:06

Alkali Metals

24.5K
Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Diffusion01:12

Diffusion

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Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
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Diffusion01:21

Diffusion

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Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
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Types of Non-structural Cracks in Concrete01:28

Types of Non-structural Cracks in Concrete

495
Non-structural cracks are primarily of three types: plastic, early-age thermal, and drying shrinkage cracks. Plastic cracks are further classified into plastic shrinkage cracks and plastic settlement cracks.
Plastic shrinkage cracks typically form within hours after the concrete is poured. The concrete's surface dries faster than the bottom, creating tensile stress that the still-plastic concrete cannot withstand, leading to diagonal or randomly patterned cracks on the concrete surface.
495
Alkali Aggregate Reaction in Concrete01:26

Alkali Aggregate Reaction in Concrete

521
The alkali-aggregate reaction in concrete involves natural siliceous minerals in aggregates reacting with alkaline hydroxides derived from cement alkalis. This reaction forms an alkali-silica gel that absorbs water, swells, and increases in volume, which is confined by the surrounding cement paste, creating internal pressures that crack and disrupt the concrete. The extent of expansion and damage can be partly attributed to the alkali-silica reaction's osmotic hydraulic pressure and the...
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Propagation of Waves01:07

Propagation of Waves

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When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
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Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation
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Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation

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Diffusion-controlled crack propagation in alkali feldspar.

E Petrishcheva1, M Rieder1, J Predan2

  • 11Department of Lithospheric Research, University of Vienna, 1090 Vienna, Austria.

Physics and Chemistry of Minerals
|March 19, 2019
PubMed
Summary
This summary is machine-generated.

Chemically driven cation exchange in alkali feldspar causes lattice contraction, inducing tensile stress and parallel crack propagation. This diffusion-controlled fracturing is crucial for understanding high-temperature geological alterations.

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Area of Science:

  • Geochemistry
  • Materials Science
  • Mineral Physics

Background:

  • Alkali feldspars undergo chemical changes during geological processes.
  • Understanding crack propagation mechanisms is vital for materials science and geophysics.

Purpose of the Study:

  • To experimentally investigate chemically driven crack propagation in monoclinic alkali feldspar.
  • To elucidate the role of cation exchange and diffusion in fracture mechanics.

Main Methods:

  • Experimental study using potassium-rich sanidine crystals.
  • Cation exchange with NaCl-KCl salt melt at 850°C.
  • Analysis of crack formation and propagation driven by diffusion and stress.

Main Results:

  • Sodium-potassium interdiffusion created sodium-rich surface layers.
  • Lattice contraction induced tensile stress, leading to parallel crack nucleation.
  • Crack propagation was controlled by coupled diffusion and stress release, with a critical energy release rate of 1.8-2.2 J/m².

Conclusions:

  • Diffusion-controlled crack propagation is a key mechanism in alkali feldspar alteration.
  • The study provides insights into fracture mechanics driven by chemical changes at high temperatures.